Electronic hydraulic braking system of automobile and control method of electronic hydraulic braking system

Abstract

The invention discloses an electronic hydraulic braking system of an automobile. The electronic hydraulic braking system comprises an electronic mechanical brake pedal, a vacuum booster, a main cylinder push rod, a hydraulic braking main cylinder, a piston, an oil storage tank 6, oil output pipes, ABS / ESP dual-input oil pipes, an ABS / ESP, an active boost controller and an active boosting device connected to one oil output pipe in series. According to the electronic hydraulic braking system, through cooperation of a self-locking electromagnetic valve and normally-closed oil output, the problems that according to an existing scheme, the pressure maintaining time is short, and the requirement for long-time braking under extreme conditions cannot be met are solved. When the system works in a manual braking mode, by controlling the self-locking electromagnetic valve to be power-off and normally open or by electrifying a normally-closed electromagnetic valve so as to open the electromagnetic valve, normal communication between the main cylinder and an ABS / ESP input pipeline can be achieved, and failure mode braking is guaranteed. According to the electronic hydraulic braking system, a pump motor is controlled in a PWM mode, a high-pressure accumulator is omitted, real-time pressure feedback is conducted through a pressure sensor, and the risk of oil leakage of the high-pressure accumulator is avoided.

Description

technical field [0001] The invention relates to the field of vehicle braking, in particular to a wire-controlled electronic hydraulic braking system and a control method thereof. Background technique [0002] With the rapid development of vehicle Advanced Driver Assistance Assistance (ADAS) and intelligent driving technology, the control-by-wire active braking system has emerged along with the trend. For example, adaptive cruise control (Adaptive Cruise Control, ACC), automatic emergency braking (Autonomous Emergency Braking, AEB), automatic start-stop system (Stop&Go) and intelligent driving assistance systems all require the braking system to be able to achieve active braking. At present, the hydraulic braking system is relatively mature, and the realization of brake-by-wire on the basis of the hydraulic braking system is the mainstream technology adopted at present. [0003] Patent CN 103318158 A proposes an integrated electronic hydraulic braking system for automobiles....

AI Technical Summary

Problems solved by technology

The pressure reducing valve also uses a normally open valve, which is connected to a sub-cylinder of the brake master cylinder to achieve failure mode braking and manual mode braking, but there is only one way, which reduces safety

[0005] However, there is a common problem in the two schemes. If the pressure is to be maintained during the braking process, the normally open pressure reducing valve needs to be energized to make it closed. Unable to maintain pressure for a long time, unable to meet the braking requirements of downhill long slopes, parking on slopes and ordinary parking

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